Impervious material



UNHTED STATES FATE QFHQE,

IMPERVIOUS MATERIAL.

No Drawing.

My invention relates to an impervious and chemical resistant material and a method for its production and its main object is to provide a material suitable for making conduits, vesgls, pumpg valves and othe similar articles and devices, which is iiinpervrousto liquids and gases and Which is proof against the corrosive action of acids and other chemicals.

The base of the material is artificial graphite Which while strictly chemipahproof, is by reason of its porosity not suitable for use in the production of apparatus employed to corn duct or contain liquids or gases and my invention consists in filling or closing the pores and interstices of the artificial graphite either before or after it has been formed into the desired shapes, with sulfur which by intimate contact with the walls thereof becomes an integral part of the material and renders it proof against the permeation of liquids and other fluids.

Since sulfur is equally capable of resisting the corrosive influences of acids and other chemicals as is the artificial graphite to which it is applied, it is evident that articles prepared according to my invention are particularly adapted for use in laboratories and factories to conduct and contain chemical liquids and gases, and that as such, the material is eminently suitable for the production of pumps, valves, conduits and vessels or containers of various types and forms.

In carrying my invention into effect, I place artificial graphite or articles made thereof in'a bath of molten sulfur which by p the properapplication of heat may be maintained in a liquid condition for an extended period.

Application filed May 3, 1923. Serial No. 638,493.

The liquid sulfur readily enters the pores and crevices of the graphite and after the material has thus been thoroughly impregnated, the bath is allowed to cool before the articles are taken out, to obtain the advantage of a maximum contraction of the molten mass prior to its final expansion.

It is desirable to remove the articles from the bath before it has cooled to a point of solidification, after which the sulfur contained in the pores and crevices of the graphite will harden in place and become a permanent and solid part of the material.

I desire it understood that while the above described process of applying the sulfur to artificial graphite is preferable by reason of its simplicity, practicability and economy, other methods may be resorted to within the spirit of my invention as defined in the hereunto appended claims, and that in accordance with the nature of the articles or the uses for which they are intended. the voids of the graphite may be completely filled withthe sulfur or merely closed at the surface thereof.

What I claim and desire to secure by Letters Patent is:

1. An article of manufacture consisting of a solid body of artificial graphite, the vp igls of which are gilps erl,witlg s Di 2. An article of manufacture consisting of a solid body of artificial graphite, the voids of Which are filled with sulfur.

In testimony whereof I have affixed my signature.

WVARREN F. BLEECKER. 

